FIG. 7.

Connection probability plots. Each plot shows the connection probability of a network, representing how likely an edge with a certain origin degree and a terminus degree exists in the network. The connection probability is concentrated along the x- and y-axes in the XSampEnt network from a representative subject (left), indicating that nodes with a variety of degrees are connected to high-degree nodes. This concentration along the axes is a sign of disassortative connectivity in which nodes with disparate degrees tend to be preferentially connected. On the other hand, the LinCorr network from the same subject (right) shows a concentration of probability along the diagonal, resulting from nodes with similar degrees being connected with each other. This is an indication of assortative connectivity in the LinCorr network. The inset shows the connection probability plot of the LinCorr network scaled to the comparable size of that of the XSampEnt network; this is to emphasize the differences in the connection probability plots between the two networks. Color images available online at www.liebertpub.com/brain